From the FreeBSD handbook ( http://www.freebsd.org/doc/handbook/users-introduction.html):

    The home directory is the full path to a directory on the system in
    which the user will start when logging on to the system. A common
    convention is to put all user home directories under /home/username
    or /usr/home/username. The user would store their personal
    files in their home directory, and any directories they may create
    in there.

All of my irreplaceable data is stored in `/usr'. `/home' is a symlink to `/usr/home', as created by the installer.